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Studies on New Synthetic Pathways to .DELTA..ALPHA.,.BETA.-butenolides From .ALPHA.-methylbutanolides. III. Regiospecific Preparation of .ALPHA.-methyl-.DELTA..ALPHA.,.BETA.-butenolides and .ALPHA.-methylene-.GAMMA.-butyrolactones by Electrolysis of .ALPHA.-carboxy-.ALPHA.-methylbutanolides and by Oxidation of .ALPHA.-dimethylamino-.ALPHA.-methylbutanolides.